The graph shows the number of families and the number of children in each family in a block of flats.
- How many children are there in the whole block of flats?
- If 23 of the families who have at least two children move out of the block of flats, how many children are there left in the block of flats?
(a)
Number of children
= 1 x 17 + 2 x 33 + 3 x 51
= 17 + 66 + 153
= 236
(b)
Number of children in families that have at least two children who have moved out
=
23 x (66 + 153)
=
23 x 219
= 146
Number of children left
= 236 - 146
= 90
Answer(s): (a) 236; (b) 90